Use of H/sub 2//H/sub 2/O gas mixtures to study adsorption on chromia-promoted magnetite at water-gas shift temperatures

Journal Article · Thu Aug 30 00:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150662a054· OSTI ID:5961838

Tinkle, M; Dumesic, J A

The adsorption of hydrogen and water on chromia-promoted magnetite at 637 K was studied. Adsorption isotherms were collected with constant composition gas-phase mixtures of hydrogen and water. The H/sub 2//H/sub 2/O ratio was varied from 2.3 to 10.8 and the adsorption data were analyzed in terms of separate hydrogen and water isotherms. It was found that, at a given hydrogen partial pressure, a higher mole fraction of water in the gas resulted in a lower hydrogen uptake. Furthermore, hydrogen uptakes passed through a maximum as a function of hydrogen pressure, for constant H/sub 2//H/sub 2/O ratios greater than ca. 3. These trends indicate that hydrogen and water compete for adsorption sites and that hydrogen adsorption is dissociative on magnetite at 637 K. 16 references, 5 figures, 1 table.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 5961838
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:18; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ADSORPTION ISOTHERMS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
DATA
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
ION MOBILITY
ION PAIRS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
ISOTHERM
KINETICS
LOW PRESSURE
MAGNETITE
MATHEMATICAL MODELS
MINERALS
MOBILITY
NONMETALS
NUMERICAL DATA
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE MOBILITY
PRESSURE DEPENDENCE
REACTION KINETICS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
WATER